The Pacific Chorale will perform two world premieres, including one by new Composer-in-Residence Tarik O’Regan, during its 2018-19 season, announced Monday, April 16.

The 140-member choral group will launch its 51st season, and second under Artistic Director Robert Istad, with a performance of Haydn’s “The Creation,” which the ensemble hasn’t performed as part of its own season in 45 years. The other new work will be by Seattle-based composer Karen P. Thomas and will receive its premiere as part of a program of works by female composers that Thomas will curate.

Here is the chorale’s season schedule:

Pacific Chorale’s Choral Festival: This community-outreach event is sponsored by the chorale and the Segerstrom Center for the Arts. The event is open to the public and community singers may register to perform starting May 1. 5 p.m. Aug. 12, Renée and Henry Segerstrom Concert Hall, Costa Mesa.

Robert Istad, director of choral studies at Cal State Fullerton, took over as artistic director of Pacific Chorale last season after the 45-year run of Artistiic Director John Alexander. (Photo courtesy of Pacific Chorale)

UnSung Heroes: The program will consist of works by female composers curated by Thomas, whose own piece will receive its world premiere. 7:30 p.m. March 30. Renée and Henry Segerstrom Concert Hall, Costa Mesa.

‘Ecstasies Above: The Music of Tarik O’Regan’: The chorale’s new composer-in-residence has been acclaimed as “one of the leading British composers of his generation. This program of his work will include the world premiere of a new a cappella piece. 5 p.m. May 18, 2019, Samueli Theater, Costa Mesa.

Pacific Chorale subscription series packages range from $60 to $500 and are available now. Tickets to individual performances go on sale June 1. For more information, call 714-662-2345 or go to www.pacificchorale.org.

Jeff Miller started at The Orange County Register in 1989 as the Costa Mesa cities reporter and later covered Huntington Beach and courts, in addition to a stint as a general-assignment reporter. He has been an editor since 1997, overseeing beats such as breaking news, courts, immigration, education, pop music, theater, visual arts, dance, TV and movies.